首页|(165396)Understanding the formation of a cubic Mn_(0.6)Fe_(0.4)S solid-solution anode and its high performance for rechargeable lithium-ion batteries
(165396)Understanding the formation of a cubic Mn_(0.6)Fe_(0.4)S solid-solution anode and its high performance for rechargeable lithium-ion batteries
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NSTL
Elsevier
A cubic Mn_(0.6)Fe_(0.4)S solid solution material has been synthesized using a scalable in situ sulfuration treatment of Prussian-blue analogs (PBAs), and its phase formation process and Li-storage mechanism were investigated. Increased treatment temperature and time encourage a phase transformation from hexagonal Fe_7S_8 to cubic FeS_2 during the sulfuration process, which results in the formation of a solid solution between cubic FeS_2 and cubic MnS. The resulting Mn_(0.6)Fe_(0.4)S solid solution electrode exhibits high initial coulombic efciency, excellent rate performance, and superior cycling stability (520 mA h g~(-1) after 1000 cycles at 1.0 A g~(-1)). Ex-situ X-ray diffractometry and electro-kinetics tests show that the doping-induced structural phase transition in Mn_(0.6)Fe_(0.4)S solid solution creates a favorable electronic structure and ensures rapid charge transfer kinetics during the lithiation/delithiation process, simultaneously achieving high energy conversion efciency and a long lifespan.
Energy storage materialsPhase transitionsKineticsElectrochemical reactionsChemical synthesisTransition metal sulfdes
Deli Li、Lingling Zhang、Jun Liang
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College of Chemistry and Chemical Engineering, State Key Laboratory of High-efciency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan, Ningxia 750021, China
NSTL
Elsevier
